According to a JPL press release, the Phoenix lander on Mars recently had an issue with its flash memory.  You can read more about the incident on Emily Lakdawalla’s blog posting about it.  Flash memory is a nonvolatile memory such as that used in memory sticks.  The RAM on board the spacecraft loses data when it is powered down for the night.  But, the flash memory holds onto the data.  Flash memory is very durable, so it is normally a safe way to store data.  However, Tuesday night,...